INSTALLATION OF MONITORING STATIONS - Wind Resource Assessment: A Practical Guide to Developing a Wind Project - page 82

5.11 QUESTIONS FOR DISCUSSION
1. Suppose you are leading a wind resource assessment campaign for a developer
interested in building a 50-MW wind project. Create a set of specifications for
an instrumentation package and tower. Indicate your desired tower height; the
heights of the speed, direction, and temperature sensors as well as any other
sensors you may choose; and the number of sensors at each height.
2. Use the Internet to obtain price and delivery quotes for your preferred pack-
age from at least two vendors. Make sure you take into account taxes and
import duties. What is the total cost of each package? Is the equipment (includ-
ing tower) to be provided substantially the same, or are there differences? In
your opinion, which meets your employer's needs in the most cost-effective
manner?
3. Describe how you would go about acceptance testing your preferred instrument
package once it is received, as well as field preparation.
4. Identify and describe at least four specific safety guidelines covered in this
chapter. State why they are important and what could happen if they were not
followed.
5. Suppose you are on a site and your GPS is broken. Given a magnetic com-
pass, how would you determine true north? What is the approximate magnetic
declination in your area?
6. You are in charge of installing a 60-m tilt-up tubular tower in a farmer's field.
The manufacturer has shipped the tower with anchors that are 44 mm wide and
381 mm long. Should you be concerned? Why? If so, what should you do?
7. Explain the function of a gin pole on a tilt-up tower. Suppose you are installing
a tilt-up tower, and you find the wind is moderate and from the west. In which
direction should the gin pole face, and why?
8. You have been asked to assess an instrumented tower installed by a company
whose wind project your employer is interested in investing in. You arrive at
the site, and using a laser range finder, you find that it is a 60-m-tall, 0.5-m-
wide, custom-built square lattice tower. You further observe a single anemometer
mounted on a vertical boom extending about 0.5 m above the top, and a single
anemometer mounted on a horizontal boom extending 2 m from the side at a
height of about 45 m. There is also a direction vane on the same boom. You
advise the company that this monitoring setup is inadequate. Why? How would
you advise that it be improved?
9. Explain the rationale for installing two anemometers at the same height. What
is the purpose of setting the boom orientations 90 ◦ apart and 45 ◦ on either side
of the prevailing wind direction? Why should booms at different heights be
oriented in the same directions?
10. What is the purpose of grounding the equipment on a met mast? In the
region where you live, what code governs electrical installations, including
grounding?